Electrode Camber Reduction via Differential Heat Treatment
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Solution Overview
Problem
The generation of camber in metal sheets during the roll-pressing process for electrode current collectors leads to deformation and potential disconnection or lamination defects, necessitating a method to minimize camber formation.
Innovation Solution
A method involving heat-treating metal sheets with a temperature difference between regions to control elongation deviations, applying an electrode slurry, and roll-pressing to form a mixture layer, thereby reducing camber and elongation deviations between coated and uncoated areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the thickness of the metal sheet is made thin and the roll-pressing density is increased, then the capacity of the secondary battery is improved, but the metal sheet is deformed and camber is generated
Solution Approach 1:
The patent applies preliminary heat treatment to the metal sheet before roll-pressing to create an elongation deviation between the coated and uncoated regions. This preliminary action modifies the material properties in advance, allowing the sheet to withstand the subsequent roll-pressing process without excessive deformation or camber generation, thus enabling higher density packaging while maintaining shape integrity
Solution Approach 2:
The patent changes the physical parameters of the metal sheet by applying heat treatment at different temperatures to different regions (coated vs. uncoated). This creates a controlled elongation deviation that compensates for the differential expansion that would otherwise occur during roll-pressing, allowing for higher pressing density without causing camber or disconnection defects
2Use of energy by moving object
If the thickness of the metal sheet is made thin and the roll-pressing density is increased, then the energy density is improved, but disconnection may occur in the notching process
Solution Approach 1:
The heat treatment is performed as a preliminary action before notching and final assembly. By creating the elongation deviation in advance through controlled heating, the metal sheet is pre-conditioned to maintain structural integrity during subsequent mechanical operations like notching, preventing disconnection even when using thin sheets for high energy density
Solution Approach 2:
The patent modifies the physical state and mechanical properties of the metal sheet through heat treatment, changing parameters such as elongation and flexibility. These parameter changes make the thin metal sheet more resistant to disconnection during notching while still allowing high-density roll-pressing for improved energy density
3Volume of moving object
If the thickness of the metal sheet is made thin and the roll-pressing density is increased, then the space utilization is improved, but lamination position defects may be caused
Solution Approach 1:
The heat treatment creates a preliminary elongation deviation that acts as a compensatory mechanism during roll-pressing. This preliminary action ensures that when the sheet is pressed at high density, the pre-conditioned regions expand appropriately, maintaining accurate lamination positions without defects even in thin sheets with high space utilization
Solution Approach 2:
By changing the physical parameters of the metal sheet through differential heat treatment, the patent creates a controlled elongation pattern that compensates for compression during high-density roll-pressing. This parameter modification allows thin sheets to be densely packed while maintaining precise lamination alignment and preventing position defects
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively suppresses camber generation and minimizes losses during the roll-pressing process, ensuring a more stable and defect-free electrode manufacturing process.
Implementation Method 1
heat-treating a metal sheet for an electrode including a first region and a second region divided in a transverse direction (TD) under a condition in which a temperature difference of 10° C. or more is applied between the first region and the second region
Implementation Method 2
an elongation deviation between the first region and the second region may be 5% or more on average, and in the roll-pressed metal sheet, an elongation amount deviation between the first region and the second region may be 3% or less on average
Data Source
AI summary
The present technology relates to an electrode with a reduced camber and a method of manufacturing the same, and particularly, to a method of manufacturing an electrode in which the generation of a camber is reduced in an uncoated part of an electrode manufactured using a metal sheet for electrodes in which a first region and a second region of the metal sheet for an electrode have different elongations.